Sligo County Council (Irish: Comhairle Chontae Shligigh) is the local authority of County Sligo, Ireland. As a county council, it is governed by the Local Government Act 2001. The council is responsible for housing and community, roads and transportation, urban planning and development, amenity and culture, and environment. The council has 18 elected members. Elections are held every five years and are by single transferable vote. The head of the council has the title of Cathaoirleach (chairperson). The county administration is headed by a chief executive, Martin Lydon. The county town is Sligo.

Originally meetings of Sligo County Council were held at Sligo Courthouse.^[1] The county council moved to modern facilities, known as County Hall (Irish: Áras an Chontae), in June 1979.^[2]

Following the 2015 RTÉ programme Standards in Public Office, in March 2019, Joe Queenan was found by the Standards in Public Office Commission to have contravened the Local Government Act in three different instances, including failure to maintain proper standards of integrity, conduct and concern for the public interest.^[3]

Sligo County Council has two representatives on the Northern and Western Regional Assembly where they are part of the Border Strategic Planning Area Committee.^[4]

Members of Sligo County Council are elected for a five-year term of office on the electoral system of proportional representation by means of the single transferable vote (PR-STV) from multi-member local electoral areas (LEAs).

County Sligo is divided into borough and municipal districts and LEAs, defined by electoral divisions.^[5] The municipal district which contains the administrative area of the former borough of Sligo is referred to as a borough district.^[6]